20210399903 has 8 divisors (see below), whose sum is σ = 20705956656. Its totient is φ = 19714968000.

The previous prime is 20210399887. The next prime is 20210399927. The reversal of 20210399903 is 30999301202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20210399903 - 2⁴ = 20210399887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210399203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354053 + ... + 407153.

It is an arithmetic number, because the mean of its divisors is an integer number (2588244582).

Almost surely, 2^20210399903 is an apocalyptic number.

20210399903 is a deficient number, since it is larger than the sum of its proper divisors (495556753).

20210399903 is an equidigital number, since it uses as much as digits as its factorization.

20210399903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62425.

The product of its (nonzero) digits is 26244, while the sum is 38.

The spelling of 20210399903 in words is "twenty billion, two hundred ten million, three hundred ninety-nine thousand, nine hundred three".